Generic method to delete a bunch of records while respecting profile and sharing access

GenericDelete.cls

/************************************************************


*** @author: Suraj Pillai
*** @group: Utils
*** @date: 01/2020
*** @description: A class for deleting a bunch of records after checking for delete access for each sobject, given a list of recordIds 

*/
public with sharing class GenericDelete {
    public class InsufficientPermissionsException extends Exception{}

/************************************************************

*** @description Deletes a list of record ids, if the user has delete permissions
*** @param List<Id> recorIds - list of record ids to be deleted
*** @param boolean throwExceptionIfUndeletable - if one of the sobjects is not deleteable by the user, throw an exception
*** @return List<Id> - list of recordIds that were actually deleted

*/
    public Id[] doDelete(List<Id> recordIds,boolean throwExceptionIfUndeleteable){
        // sort the ids so same sobjects are grouped together
        recordIds.sort();
        Id[] deletedIds = new Id[]{};
        String currentPrefix='';
        boolean currentIsDeleteable = false;
        for(Id recordId: recordIds){
            String prefix = String.valueOf(recordId).subString(0,3);
            //compare prefixes to see if the sobject has changed
            if(prefix!=currentPrefix){
                currentIsDeleteable = false;
                Schema.DescribeSObjectResult sobjDescribe = recordId.getSobjectType().getDescribe();
                if(!sobjDescribe.isDeletable()){
                    if(throwExceptionIfUndeleteable){
                        throw new InsufficientPermissionsException('Insufficient permissions to perform the requested action');
                    }
                }else{
                    currentIsDeleteable = true;
                }
            }
            else if(currentIsDeleteable){
                deletedIds.add(recordId);
            }
            currentPrefix = prefix;
        }
        if(deletedIds.size()>0)
            Database.delete(deletedIds);
        return deletedIds;
    }
}